[c-nsp] RE: Interesting iBGP problem

[Stephen J. Wilcox]

you're missing next-hop-self in the below config, you need to add it to all your 
ibgp sessions on all routers

its also mentioned you may be missing no sync altho its not clear if you just 
omitted that

what does the output from 'sh ip bgp x.x.x.x' look like for one of the prefixes? 
copy that along with a sh ip route y.y.y.y where y.y.y.y is the next-hop given 
by the sh ip bgp command above

Steve

On Tue, 14 Sep 2004, Kevin wrote:

> I'll reply to myself on this one,
> I've added a c5500-RSM to the ibgp mix with the config below, it's
> running 12.1(20) For some reason it's not adding routes to the bgp table
> at all, Is their something that I have todo specificly add bgp routes to
> the routing table, with this older IOS? I did do next-hop-self on the
> other two routers.
> 
> Kevin,
> 
> 
> router bgp 25720
>  bgp log-neighbor-changes
>  neighbor 192.168.1.1 remote-as 25720
>  neighbor 192.168.1.1 update-source Loopback0  
>  neighbor 192.168.1.2 remote-as 25720  
>  neighbor 192.168.1.2 update-source Loopback0
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Kevin
> Sent: Monday, September 13, 2004 11:16 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Interesting iBGP problem
> 
> I have two 7500 routers, border1 and border2, border1 currently has a
> GiGE to a backbone router, border2 will soon have an ds3 to another
> providor. I have a GIGe connection between the routers.
> Border2 has a brand new default config. Basically what I can tell is
> happening is that when I configure iBGP between the two routers, border2
> will insert all the ebgp routes from border1 into the routing table and
> then about 1min later it'll remove all the routes out of the routing
> table. Then after another minute the routes are back. Has anyone seen
> this before? I checked to see if bgp was flapping, and it was'nt. I
> checked for interface errors, their was'nt any.
> I am running 12.3(8)T3 on these routers. Below are the bgp configs.
> 
> 
> Kevin,
> 
> 
> Border1:
> router bgp 25720
>  bgp log-neighbor-changes
>  bgp bestpath compare-routerid
>  neighbor 192.168.1.2 remote-as 25720
>  neighbor 192.168.1.2 update-source Loopback0  neighbor 207.67.87.49
> remote-as 4323  neighbor 207.67.87.49 description TWtelecom  neighbor
> 207.67.87.49 version 4  !
>  address-family ipv4
>  neighbor 192.168.1.2 activate
>  neighbor 207.67.87.49 activate
>  neighbor 207.67.87.49 next-hop-self
>  neighbor 207.67.87.49 remove-private-as  neighbor 207.67.87.49
> soft-reconfiguration inbound  neighbor 207.67.87.49 distribute-list
> BGP_Advertisment out  neighbor 207.67.87.49 route-map tw-in in  no
> auto-summary  no synchronization  network 199.199.208.0 mask
> 255.255.248.0  aggregate-address 199.199.208.0 255.255.248.0
> summary-only  exit-address-family
> 
> Border2:
> 
> router bgp 25720
>  no synchronization
>  bgp log-neighbor-changes
>  neighbor 192.168.1.1 remote-as 25720
>  neighbor 192.168.1.1 update-source Loopback0  no auto-summary
> 
> 
> 
> 
> 
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